paper

Direct Calculation of the Spin Stiffness in the -- Heisenberg Antiferromagnet

arXiv:cond-mat/9410090 · doi:10.1103/PhysRevB.51.6151

Abstract

We calculate the spin stiffness for the frustrated spin- Heisenberg antiferromagnet on a square lattice by exact diagonalizations on finite clusters of up to sites followed by extrapolations to the thermodynamic limit. For the non-frustrated case, we find that , in excellent agreement with the best results obtained by other means. Turning on frustration, the extrapolated stiffness vanishes for . In this intermediate region, the finite-size scaling works poorly -- an additional sign that their is neither Néel nor collinear magnetic order. Using a hydrodynamic relation, and previous results for the transverse susceptibility, we also estimate the spin-wave velocity in the Néel-ordered region.

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